Distributed pre-emphasis equalizer

Details Distributed pre-emphasis equalizer Distributed pre-emphasis equalizer

1997-03-17

1998-12-08

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

381 4, 333 28R, H03G 500

Patent

active

058481672

ABSTRACT:
A distributed pre-emphasis equalizer comprises a partial pre-emphasizer and a (50) microsecond pre-emphasizer. The partial pre-emphasizer receives an input signal and produces a partially pre-emphasized output signal. The (50) microsecond pre-emphasizer receives the partially pre-emphasized output signal from the partial pre-emphasizer and adds a (50) microsecond equalization to produce a pre-emphasized output signal equal to a standard (75) microsecond pre-emphasis curve. The distributed pre-emphasis equalizer allows an FM audio processor to produce only the "dulling" effect of a (50) microsecond pre-emphasis even when generating a (75) microsecond pre-emphasis curve. The distributed pre-emphasis equalizer also creates a pre-emphasizing method which is inherently compatible with both the (75) microsecond and (50) microsecond standards. Furthermore, the distributed pre-emphasis equalizer creates a pre-emphasizing method which is easily switchable between the (75) and (50) microsecond standards.

REFERENCES:
patent: 4208548 (1980-06-01), Orban
patent: 4241266 (1980-12-01), Orban
patent: 4525857 (1985-07-01), Orban
patent: 5168526 (1992-12-01), Orban
patent: 5315660 (1994-05-01), Anderson et al.

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